A. Sutherland – AncientPages.com – Known in various mythologies under different names such as ‘Knocker’, ‘Coblynau’, ‘Kobold’ or ‘Skarbnik’ (The Treasurer), these mythological spirits were believed to be a species of fairies that had their dwellings in the rocks and crevices. Still, their homes were invisible to mortal eyes.
They made noises and knocks to announce their presence, the presence of metal and minerals, or they could assist a miner giving helpful tapping warnings of looming danger.
These ugly, often naughty creatures stole candles, hid clothes, and picked. Sometimes they were malevolent by threatening miners during their hard and dangerous work.